Universal time indicating clock



April T. L. ROBERTSON 2,078,345

UNIVERSAL TIME INDICATING CLOCK Filed April 24, 1936 2 Sheets-Sheet 1 Invento'r By Mm g I Attomey;

April 27, 1937. T. ROBERTSON UNIVERSAL TIME INDICATING CLOCK Filed April24, 1936 2 Sheets-Sheet 2 Inventor 3016/7550 Patented Apr. 27, 1937UNITED STATES PATENT OFFICE 2.0mm umvsassr. TIME mnrosma CLOCK Thomas L.Robertson. Longview, Wash.

Application April 24, 1988, Boris! No. 10,275 1 Claim. (01. ss-u) Thisinvention appertainstojnew and useful pane l3 and the glass pane II isheld in place improvements in the general art-of horology and againstthe inturned ilange ll of the rim 8 by more particularly to a novelworld time indicatthe spring members I I. ing clock mechanism. The rim Idoes not have any motion except The principal object of the presentinvention that it can be rotated until the geographical 5 is to providea clock mechanism including a rolocation on dial I corresponding to theplace tary dial having indicia thereon representing where the clock islocated coincides with the time intervals, and a stationary dialcarrying hour (indicated on dial it) representing local geographicalnames mounted in proximity to the time at the place where the clock issituated.

rotary dial. This rim 8 has its dial marked as follows: 10

Another important object of the invention is The same is divided intotwenty-four equal to provide a simply constructed world timetellportions, each portion representing fifteen deing clock structurewhich will be of considerable grees of longitude for one hour of time,each assistance to persons having long range short division line beingnumbered on its outside end wave radio receivers. with its respectivedegrees of longitude in the 15 Other important objects and advantages oithe same manner in which degrees of longitude are invention will becomeapparent to the reader marked on a world map. Each portion of the of thefollowing specification. dial 8 is further divided by a line of halfhour In the drawings: marks. Running laterally and continuously Figure 1represents a front elevational view around the center of this dial is amark or line 20 of the mechanism. which is lettered Equator". Aroundthis rim Figure 2 is a fragmentary side elevational view 8 and close tothe degree or divisional line which with the main portion of thestructure in vermarks the time zones are placed the names of ticalsection. various countries of the world. These names Referring to thedrawings wherein like nuare placed on the inside of the Equator line ifmerals designate like parts, it can be seen that they are located abovethe Equator and on the numeral 5 represents the clock back and whichoutside of the Equator line if they are located on its front side has aplurality of small clips below the Equator. Names of countries on the 0secured thereto for engaging against the roll half hour standard areplaced near the half hour I on the inner edge portion of the annular rimmark. The Greenwich Meridian and the date 30 I. This rim is rotatable inthe clips 8 to perline are also shown in their respective places. mitadjustment of the annular dial 9 with re- While the foregoingspecification sets forth spect to the rotary dial Ill. The dial II issitthe invention in specific terms, it is to be underuated inconjunction with the pointer ii and stood that numerous changes in theshape, size has the gear train i2 driving the same. and material may beresorted to without de- 35 The dial l0 rotates in a clock-wise directionparting from the spirit and scope of the invenat a speed of onerevolution in twenty-four tion as claimed hereinafter.- hours, the samebeing carried by the gear mech- Having described the invention what isclaimed anism If. The dial in is marked by having a is:-

line drawn diametrically therethrough the one A clock structurecomprising a back, guides 40 end portion of which is marked Midnightwhile carried by the back, an annulus having its inner the other endportion is marked Noon. Each edge rotatably supported by said guides, aclock half of the dial is divided into twelve equal parts mechanismmounted on the back within the conwhich represent the hours from one totwelve fines of the annulus, a rotary dial carried by the A. M. and oneto twelve P. M. and are so marked clock mechanism and having indicisthereon 45 in a counter-clock-wise manner. Each hour is representingtime intervals, and a second dial of then calibrated into five minuteperiods and the annular construction secured to the outer edge fifteen,thirty and forty-five minute periods are of the annulus, said seconddial having its inso marked. The shaded portion of the dial iii ner edgeterminating at approximately the pe- 60 from six P. M, to midnight andfrom midnight riphery of the rotary dial and having indicia to six A. M.is so colored to represent the dark thereon indicating differentgeographical places. part of the twenty-four hour period.

The annular dial 9 is secured against the glass THOMAS L. ROBERTSON.

